Speedo Buggered

Speedo suddenly stopped working on the way into work last night. The needle doesn't register at all. So I've been riding around pretty clueless and crawling past cameras.

Now I gather that it's an analogue speedo measured at the sprocket, and I have no idea how to go about diagnosing/fixing it Any guidance, or should I just drop it at the garage tomorrow?

 

there should be a threaded in sender with a flexible cable connected to it. depending on how it is configured. If there is wires coming from it, I'd suggest the sender being fooked and not sending a signal down the cable to your speedo. If there is a cable(like a brake/clutch) then the analgue to digital conversion will be done at your clocks. so you could check to see if the cable has broke. its not actually a cable. its a flat thin flexible blade that connects to your gearbox and spins.

it could be your sender. I'd disconnect the cable behind your clocks and mark it with some paint then go around the block. if its moved then your clocks are buggered. If it doesn't move. and you've physically checked the cable is fine then its your gearbox sender.


best diagnosis is individual elimination!!!! Good Luck hope it makes sense. I'm out out on the lash.

 

Thanks Mark.

Unfortunately the whole instrument panel is a fully sealed up all in one jobby with one cable hole for everything so it's a bit difficult to see exactly how it works without dismantling the thing. From what I can tell though, it's a brake/clutch type cable going to the speedo (from wherever it is it's measured), not an electrical wire. All the electrics on the instrument panel work exactly as they should, including the backlight to the speedo.

Anyway, I think I'll nip down to Halfords tomorrow and grab a bicycle speedo and dismantle the bike to sort it out when I've got some time free. Either that or just ask them to sort it when I take it in for the next service in 1k miles or so.

 

its a mechanical sender then. price one up. might be worth a go. thats the element open to the most abuse as its spinning up with the gearbox.